Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos status existem para o distrito de Durham?
 ###Tabelas: CREATE TABLE former_districts (former_districts_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Status VARCHAR, Date abolished VARCHAR, Former county VARCHAR, Successor VARCHAR) CREATE TABLE current_codes (current_codes_id AUTO_INCREMENT PRIMARY KEY, Code VARCHAR, Subdivision name ( be ) (BGN/PCGN) VARCHAR, Subdivision name ( be ) (GOST) VARCHAR, Subdivision name ( ru ) (BGN/PCGN) VARCHAR, Subdivision name ( ru ) (GOST) VARCHAR, Subdivision category VARCHAR) CREATE TABLE 1970–1979 (1970–1979_id AUTO_INCREMENT PRIMARY KEY, January VARCHAR, February VARCHAR, March VARCHAR, April VARCHAR, June VARCHAR, July VARCHAR, August VARCHAR, September VARCHAR, October VARCHAR, November VARCHAR, December VARCHAR) CREATE TABLE easy_rock_stations (easy_rock_stations_id AUTO_INCREMENT PRIMARY KEY, Branding VARCHAR, Callsign VARCHAR, Frequency VARCHAR, Power (kW) VARCHAR, Location VARCHAR) CREATE TABLE longest_run_at_number_one (longest_run_at_number_one_id AUTO_INCREMENT PRIMARY KEY, Position VARCHAR, Artist VARCHAR, Single VARCHAR, Year VARCHAR, Weeks VARCHAR)  
SELECT COUNT Status FROM former_districts WHERE District = Durham